The aim of the present work is to evaluate the impact of the self-esteem on the sportive performance in a sample of 180 young adolescents attending school. To achieve this objective, we used the ROSENBERG scale known for the assessment of self-esteem. Moreover, we chose the floor gymnastics to evaluate the sports performance.The results showed low self esteem and sports performance in this group of teenagers. Girls displayed lower self-esteem and lower performance compared to boys. As far as the age is concerned, adolescents who are between 13 and 14 years old present higher performance compared to older ones. The correlation analysis showed that self-esteem has a positive effect on sports performance. In conclusion, it should be noted that the sports performance depends on the self esteem which means that a better management of mental health of adolescents could improve significantly their sports performance.